(19)
(11) EP 4 779 716 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.10.2026 Bulletin 2026/41

(43) Date of publication A2:
22.07.2026 Bulletin 2026/30

(21) Application number: 26181533.6

(22) Date of filing: 28.08.2020
(51) International Patent Classification (IPC): 
C01G 53/82(2025.01)
H01M 4/131(2010.01)
H01M 10/0525(2010.01)
 C01G 53/506(2025.01)
H01M 4/525(2010.01)
(52) Cooperative Patent Classification (CPC):
H01M 4/525; Y02E 60/10; C01P 2004/61; C01P 2004/51; C01P 2004/53; C01P 2004/84; C01P 2002/54; H01M 4/131; H01M 10/0525; C01G 53/82; C01G 53/506
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 09.09.2019 JP 2019163571

(62) Application number of the earlier application in accordance with Art. 76 EPC:
25193104.4 / 4618192
20862903.0 / 4030508

(71) Applicant: Panasonic Holdings Corporation
Kadoma-shi, Osaka 571-8501 (JP)

(72) Inventors:
  • GOTO, Natsumi
    Osaka, 540-6207 (JP)
  • KO, Takashi
    Osaka, 540-6207 (JP)
  • SUZUKI, Shinya
    Osaka, 540-6207 (JP)
  • NIINA, Fumiharu
    Osaka, 540-6207 (JP)
  • TSURUTA, Sho
    Osaka, 540-6207 (JP)

(74) Representative: Novagraaf International SA 
Chemin de l'Echo 3
1213 Onex, Geneva
1213 Onex, Geneva (CH)

   


(54) POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY


(57) This positive electrode active material for a nonaqueous electrolyte secondary battery includes a lithium transition metal composite oxide that contains at least 80 mol% of Ni with respect to the total number of moles of metal elements excluding Li. B is present at least on the surfaces of the particles of the composite oxide. When particles having a particle diameter larger than a volume-based particle diameter of 70% (D70) are defined as first particles and particles having a particle diameter smaller than a volume-based particle diameter of 30% (D30) are defined as second particles, the molar fraction of B with respect to the total number of moles of metal elements excluding Li in the second particles is higher than the molar fraction of B with respect to the total number of moles of metal elements excluding Li in the first particles.







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